Huxley, Professor, [67]-[69], [71], [72], [95], [103], [109], [130], [131], [137], [141], [163], [172], [173], [231], [247], [273].

Hybrids, mortality of, [124].

Hydrocyonina, [146].

Hyperphysical action, [253].

Hyrax, [179].

I.

Ichthyopsida, [109].

Ichthyosaurus, [78], [106], [132], [177].

Ichthyosis, [183].

Iguanodon, [71].